The next afternoon at Mrs. Dubose’s was the same as the first, and so was the next, until gradually a pattern emerged: everything would begin normally— that is, Mrs. Dubose would hound Jem for a while on her favorite subjects, her camellias and our father’s nigger-loving propensities; she would grow increasingly silent, then go away from us.
There are no more uses of "propensity" in the book.
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…now, and he knew she had a sense of humor, and she knew he did, too, and somehow he made her feel safe, made her trust that he would never bring it up again, that this terrible thing she said would remain betWeen them, that they both understood mistakes are made by all and that they should, if everyone is acknowledging our common humanity, our common frailty and propensity for sounding and looking ridiculous a thousand times a day, that these mistakes should be allowed to be forgotten.
Dave Eggers -- The Circle
I was too nervous to bother explaining that one of my father’s vices had been his propensity for dirty limericks.